php - SQL Update/Insert with loop for $_GET

I'm using ajax scripts for most of my site's functionality. In order to update or insert a row in particular table i send the request with $_GET, then retrieve each value with

foreach ($_GET as $item => $value){
        $$item =addslashes($value);
    }
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and then i have this SQL Statement for the query

if($_GET['action']=='update'){
     $sql =$conn->query("UPDATE `newDrivers` SET `idCompany`='$idCompany', ...
     WHERE `id`='$id'");
}
else{
     $sql =$conn->query("
    INSERT INTO `newDrivers`(`idCompany`, ...) 
    VALUES ('$idCompany', ...)");
} 
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I see inefficiency, naming each column and creating new file for each table i have. Is there any way i can update/insert without naming each column individually so the script would be more of a universal one?